Cod sursa(job #2725569)

Utilizator cyg_mihaizMIHAI ZARAFIU cyg_mihaiz Data 19 martie 2021 10:52:50
Problema Range minimum query Scor 80
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.24 kb
#include <fstream>
#include <climits>

using namespace std;
const int NMAX = 100000;

ifstream fin("rmq.in");
ofstream fout("rmq.out");

int minx;
int aint[4 * NMAX + 100];

void update(int node, int st, int dr, int poz, int val)
{
    if(st == dr)
    {
        aint[node] = val;
        return;
    }

    int med = ((st + dr) >> 1);
    if(poz <= med)
        update(2 * node, st, med, poz, val);
    else
        update(2 * node + 1, med + 1, dr, poz, val);
    aint[node] = min(aint[2 * node], aint[2 * node + 1]);
}

void query(int node, int st, int dr, int start, int fin)
{
    if(start <= st and dr <= fin)
    {
        minx = min(minx, aint[node]);
        return;
    }

    int med = ((st + dr) >> 1);
    if(start <= med)
        query(2 * node, st, med, start, fin);
    if(med < fin)
        query(2 * node + 1, med + 1, dr, start, fin);
}

int main()
{
    ios_base::sync_with_stdio(false);
    fin.tie(NULL);

    int n,m,i,x;
    fin >> n >> m;
    for(i = 1; i <= n; i++)
    {
        fin >> x;
        update(1, 1, n, i, x);
    }
    while(m--)
    {
        fin >> i >> x;
        minx = INT_MAX;
        query(1, 1, n, i, x);
        fout << minx << "\n";
    }
    return 0;
}